Basal Melt Rate Beneath Pine Island Ice Shelf (2014)
The basal melt rate at a single location beneath Pine Island Ice Shelf was observed using an autonomous phase-sensitive radio echo-sounder (ApRES) during 2014. The ApRES was deployed approximately 10 km from the ice shelf front where the ice was 492 m thick and the ice shelf draft was approximately...
| Main Authors: | , , , |
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| Format: | Dataset |
| Language: | English |
| Published: |
Polar Data Centre, Natural Environment Research Council, UK Research & Innovation
2018
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| Subjects: | |
| Online Access: | https://dx.doi.org/10.5285/0cf552a6-cd62-4da0-8289-8e4bab0a35a8 https://data.bas.ac.uk/full-record.php?id=GB/NERC/BAS/PDC/01106 |
| Summary: | The basal melt rate at a single location beneath Pine Island Ice Shelf was observed using an autonomous phase-sensitive radio echo-sounder (ApRES) during 2014. The ApRES was deployed approximately 10 km from the ice shelf front where the ice was 492 m thick and the ice shelf draft was approximately 422 m. The ApRES was deployed as part of the NERC Ice Sheet Stability Program (iStar). : The data was processed following Nicholls et al. (2015). Formally, the raw Lagrangian ice shelf thinning rate at two-hourly resolution was derived from the time-derivative of the distance between the ApRES antennas and the ice shelf base, and includes the basal melt rate signal as well as a component of ice-column vertical strain rate resulting from ice flow and snow compaction. To remove the component of ice-column vertical strain rate due to tidal variations, the raw thinning rate was low-pass filtered using a cut-off at 48 hours. At frequencies lower than this, variability in the strain rate component is small compared with the basal melt rate and varies on a much longer timescale than those of interest here. : The basal melt rate has an accuracy of +/- 0.2 m/yr and has been fully quality controlled. There are no missing values. |
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